Internal GFRP Reinforcement of Low-Grade Maritime Pine Duo Timber Beams

Abstract

This paper presented an experimental structural-scale test campaign used to analyze the flexural behavior of low-grade maritime pine (Pinus pinaster Ait.) duo timber beams reinforced with an internal glass fiber-reinforced polymer (GFRP) sheet. For this purpose, thirty (30) unreinforced duo beams and thirty (30) duo beams internally reinforced with a unidirectional GFRP sheet with an areal mass of 1200 g/m2 were produced and tested. The addition of a low GFRP reinforcement ratio (1.07%) in the tension zone of the duo beams provided an average improvement of 8.37% in bending stiffness (EI) and an increase of up to 18.45% in ultimate moment capacity. In addition to this improved bending behavior, the internal GFRP reinforcements seemed to decrease the influence of wood singularities and wood heterogeneity on mechanical properties, which allowed for better characteristic values to be reached and for the achievement of results with less variability.

Strength Properties of Structural Glulam Elements from Pine (Pinus sylvestris L.) Timber Reinforced in the Tensile Zone with Steel and Basalt Rods

“…In the case of new, currently designed structures, we may observe a trend towards the construction of composite structures, utilising properties of various materials, e.g., through reinforcement in the tensile zone of wooden beams produced from inferior quality timber [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Among other things, these measures aim at the optimisation of their cross-sections and increased use of inferior quality materials, in this case timber; additionally, such elements are relatively easy to manufacture.…”

The Influence of CFRP Sheets on the Load-Bearing Capacity of the Glued Laminated Timber Beams under Bending Test

“…FRP materials and wood can cooperate better with each other because they have similar thermal expansion. What is more, as some examples show, according to [ 16 ], the internal GFRP reinforcement, besides improving load-bearing capacity in bending, may also decrease the influence of materials’ natural flaws on mechanical properties and positively affect reached characteristic values and lower variability of the results.…”

“…The obtained strengthening ranged from 20 to 40% in the case of unidirectional reinforcement with the use of carbon fiber composites when compared to unreinforced reference beams [ 16 ]. De la Rosa Garcia et al conducted the analysis of the load-bearing capacity and flexural stiffness of timber beams reinforced with carbon and basalt composite in [ 47 ].…”

Real‐Time Monitoring of Timber‐Surface Crack Repair Using Piezoelectric Ceramics

“…In terms of component connection reinforcement, the iron components are easy to rust, which will have a certain impact on wooden materials and building appearance [7,8]. Therefore, more and more iron materials are replaced by fiber composite materials [9,10], such as carbon fiber strips [11] instead of steel hoop to reinforce cracks and tenon and fiber cloth [12][13][14][15] instead of steel plate to reinforce wooden beams. Compared with traditional materials, fiber composite materials have excellent mechanical properties, thin material, strong fire resistance, and have little influence on building appearance.…”